... ,NBR,NR FKM, etc 2: Have lots of existed o-ring molds 3: Available in various sizes and colors We are ... us.Materials: Polyurethane(PU), NBR,FKM,FPM,VITON,SIL,ACM,EPDM,H-NBR,NR,EVA,etc. PA,TPU,PE,PP,PTFE ... accepted.Building a Brand New Future Various Rubber Silicone O-ring,Silicone Sealing Ring